Why don’t Priests pray for the souls of the poor without payment of money which only the rich can afford?

The Catholic Answers

Priests pray every day for the souls in purgatory without payment of money, and without any discrimination between the rich and the poor. When someone asks for a special intercessory Mass, offering the customary stipend, the Priest will comply with the request. But this is in addition to his personal prayers for the dead.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty